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Effects of inertia of dislocations on the probability of unpinning by ultrasound
Author(s) -
Azhazha Zh. S.,
Landau A. I.
Publication year - 1975
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19750100610
Subject(s) - dislocation , inertial frame of reference , inertia , softening , action (physics) , ultrasonic sensor , constant (computer programming) , physics , materials science , condensed matter physics , classical mechanics , acoustics , computer science , quantum mechanics , programming language
Abstract The paper is concerned with theoretical models of dislocation segments fixed at their ends to local obstacles of either the same or two different types. The dislocation inertial properties are shown to influence substantially the probability of unpinning from the local obstacles as the crystal is subjected to ultrasonic oscillations. The unpinning probability in the presence of oscillations can be much higher than that with a constant load of the same magnitude. In the case of two types of obstacles, the weaker can play a “provocative” role facilitating unpinning of dislocations from the stronger obstacles. The considered effects constitute admittedly one of microscopic mechanisms of the plasticizing and “softening” action of ultrasound.